Worlds is a novel written by Joe Haldeman and published in 1981.
Worlds is a novel in which Marianne O'Hara takes an educational trip from New New York in orbit to visit the surface of old Earth, and a worldwide terrorist plot kills almost everyone. [1]
Colin Greenland reviewed Worlds for Imagine magazine, and stated that "It feels perverse to say that a series about the near extinction of the human race seems uneventful, but somehow it does. The futuristic detail is fascinating, but Haldeman relates it in a casual, rambling way that dilutes much of its drama." [1]